Relief valve



Dec. 27, 1938. H. ALLEN 2,141,835

RELIEF VALVE Original Filed July 8, 1933 LlIZ? I 2' Patented Dec. 27, 1938 I UNITED STATES PATENT OFFICE RELIEF VALVE Herbert Allen, Houston, Tex.,' assignor to Abercrombie Pump 00., Houston, Tex., a corporation of Texas Original application July 8, 1933, Serial No.

679,467, now Patent No. 2,071,376, dated Februmy 23, 1937. Divided and this application August 24, 1936, Serial No. 97,493

2 Claims. (Cl. 137-53) This application is a division of my application relieved or to any other container to which the Serial No. 679,467, filed July 8, 1933, which has valve is to be applied. The body is provided with matured into Patent No. 2,071,376, granted h n r nce passage 4 and h di h r p s February 23, 1937, 5. The valve member 6 is slidably positioned The i nti n r 1 t t an improvement i within the housing in order to close the entrance 5 shearing relief valves which are adapted for conpassa 4 ga nstth s p Of fluid pt w nection to fluid pressure lines or pumps wherethe pressllre 0f the fluid exceeds a p ete ed in it is desired that the pressure will be released Value, Whleh y y in acco dance with the when such pressure exceeds a predetermined use Of the Velvet, The valve member is deposited in the relief It is one of the objects of the invention to prochamber 7 t is made p Of a S e 8, which vide a relief valve wherein the valve member carries the resilient packing ring 9 and the washer normally remains in closed position, but is adapt to, Which po ts the packing member 9. The ed to be released by the shearing of a member D g memher ay be of rubber or other suitso that the valve will move to open position and able composition which will withstand the presbe cushioned when it arrives in full open position. sure? to be eneeuntered, and 18 preferably of Another object of the invention is to provide the h type Whlch has the e e groove H a tapered stem for relief valves in combination thel'em so that when t' t 1S apphed t0 the with a cushioning member so that upon release posed t the peclfhng W111 to expandand 20 of the valve the shock of opening will be form a tight seal against the seating face I3 and 20 sorbed by the cushioning against the stem 8. ThlS packing 9 has consid- Another object of the invention is to provide emhle reslhehce, that in event the peektng a tapered stem for relief valves so that the stern adheres to the .Seatmg face Pressure epphed will tend to expand a cushion and form a seal to t t W111 Cause m nt 9f the stem 8,

about the Valve Stem. which W111 release the valve. This packing is A still further object of the invention is to' proheld on the Stem by means retelhlhg pm vide a shear relief valve which may release at The ghheral forth of thls P h mg 15 Shewn in different pressures. my prior copending application referred to here- A still further object of the invention is to th 1 f t f th t provide shear pins of varying sizes for the relief 0 e phhclph ea ures 0 e preseh 30 valve so that the valve may have a Wider usage invention is the arrangement whereby the valve and be adaptable for connection to lines having hhember h gradually brought to 9 stop at the different pressures time shearing occurs. It seems obvious that when Other and further objects of the invention will the shear h releases that the ehhre valve 33 be readily apparentwhenthe following descripmember Whl move back sharply agamst the i cushion l8, which is carried by the cap l9 atggg ig gfg igi $1533? on wlth the accom tached to the body 2. It has been found, how- Fig. 1 is a side elevation partly in section illusever that the cushion additioh to Stopping trating the arrangement of the usual valve conh Valve member when It moves to open posh 40 struction tion, can also be used to form a seal about the 40 Fig. 2 is a section taken on the line 2-2 of Fig. stem. 8 to t h lehkage from the valve 1 looking in the direction of the arrows and illushOusmg' i m t t 8 has a trating one form of arrangement wherein difporhoh 2o h Whlch 1S adhhted to ferent Sized Shear pins may be provided. move into the opening 2| of the cushion I8 The present application relates to somewhat the as the valve mhves to Open posltlon- 45 same general construction as disclosed in my 00- W e pm sheets h Valve W111 ve pending application for a relief valve, Serial No. qulckly uhth tapered tlon engages the 533,280, filed January 23 1932 which has cushion l8. ThlS permits a quick relief of the t d t t t 2 071 375 granted pressure because the packing 9 moves out of its February 23 1931 seat l3 and into the relief chamber 1 very quick- 50 The valve embodies a housing illustrated at I W As soon as the Valve is completely open, in Fig. 1, which may be of any desired configuraever, the tapered portion 20 engages t e eushi0n tion. It is intended, however, that the shank 2 2| and because of the enlarg d r t e thereof will be threaded or flanged for attachcushion I8 is gradually expanded to bring the ment to the pipeline 3 where the pressure is to be valve member to a stop. The taper 20 forms a 55 seal with the cushion, so that there can be absolutely no leakage from the valve when it is in open position.

Fig. 2 shows the arrangement for providing adjustability of the valve in order to adapt it to difierent operating conditions and obtain different shearing values. With this in mind, a plurality of transverse openings, such as 22, 23 and 24, are provided. While three openings have been shown, it seems obvious that any desired number may be provided. Each of these openings is of a difierent diameter and adapted to receive a different size shear pin. The pin I1 is shown in the largest diameter hole and, of course, will thus provide the greatest shearing strength. When the valve is to be applied to a particular location, a pin may be inserted in the proper size opening in order to obtain the desiredshearingstrength. It seems obvious that the shearing strength of the difierent nails or pins to be used can be computed in advance and these values stamped on the valve if desired. The stem 8 has an opening 25 therein to receive the shear pin. This opening may be of the same diameter as the largest opening in the cap is so that it will take any'size shear pin. The stem may, however, be provided with additional openings, such as 26 and 21, which correspond in size to the openings 23 and 22, respectively.

With the present arrangement, the valve may have a varied application because it can be marketed with shear pins or different strength, or instructions may be provided to use ordinary forms of nails as shear pins and the shearing strength of difiezent size nails provided.

The general arrangement and assembly of the housing and valve member provide a very convenient arrangement because the shear pins may be replaced without removing any portion of the valve whatever, and it is only necessary to move the valve member back to the position shown in Fig. 1 after it has released in order to re-set the valve. The desired size 01' shear pin can then be inserted, and the valve is again ready for operation'. The valve is particularly adapted for 10- cations where it is probable that the valve will remain inactive for long periods of time, because under these conditions the packing member 9 becomes vulcanized or corroded and adheres to the seat 13. When the excessive pressure occurs, however, this pressure is exerted on the end oi the stem 8 and the face I2 of the packing to such an extent that the stem will yield and cause shearing of the pin without any movement or breaking of the seal between the packing and the housing.

What is claimed as new is:

1. A valve comprising a housing, a valve member, a stem on said valve member passing through said housing, said stem and housing having a plurality of aligned openings of difl'erent sizes spaced axially of said stem and housing whereby frangible pins of diiferent sizes may be inserted to give desired shearing strength:

2. In a shear relief valve a valve member, a stem therefor, a housing for said member, a cap about said stem, and a plurality of difierent sized diametrically arranged intersecting openings in said cap intersecting said stem so that pins of suitable sizes to fit said openings may be inserted to vary the pressure at which said valve will open.

HERBERT ALLEN. 

